Albert rontke



(No Model.)

A. VRONTKE. SHUTTLE DRIVING MEGHANISM POR SEWING MACHINES.

No. 455,115. PatentedJune 30, 1891.

UNITED STATES PATENT OFFICE.

ALBERT RONTKE, OF CHICAGO, ILLINOIS, ASSIGNOR TO JAMES BOLTON, OFF

l SAME PLACE.

SHUTTLE-DRIVING MECHANISM FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 455,115,`dated J' une 30, 1,891..

Application filed July Il, 18897l Serial No. 317,191. (No model.)

To @ZZ whom t may concern: Be it known that I, ALBERT RONTKE, a citizen of Germany, residing at Chicago, in thecounty of Cook and State of Illinois, have invented certain new and useful Improvements in Shuttle-Driving Mechanism for Sewing-Machines, of which the following' is a specification, reference being had therein to the accompanying drawings.

My invention has for its object to provide a smooth and positively-operating shuttledriving mechanism for rotary shuttle sewing-machines,said mechanism consisting of the fewest possible parts.A To this end I provide the forward end of the shuttle-operating shaft with a slotted and curved driverguide which is rigidly attached to said shaft. Rearward of this driver-guide is a stationary eccentric, preferably having a rounded face against which bears two wings or projections on a segmental driver iitted to work freely in the slot of the said driver-guide', the outer ends or horns of the said driver (which latter slides back and forth in its guide as the shaft is rotated) being alternately projected into and withdrawn from recesses in the shuttle as the movable parts are rotated, thus allowing the loops of needlethread to pass around the shuttle without entire disconnection of the latter from the driver.

In the drawings, Figure l is a vertical section through the shuttle-race, shuttle, and adjacent parts of a machine with my invention applied thereto, and Fig. 2 is a horizontal section of the same. Fig. 3 is a front elevation of the shuttle-race and driver-guide with the shuttle removed, and Fig. 4 is a detail perspective view of the driver.

A denotes the rotating-shuttle driving shaft, and B the shuttle-race, from which latter extends rearwardly a portion b, on which is formed an eccentric b', preferably having a rounded face. The portion b hasa sleeve b2 attached to the hanger a. The shaft A passes through the sleeve b2, the portion b, and the eccentric b', and is slotted at its forward end for the reception of the sliding alternating segmental shuttle-driver C, having the wings or projections c, with concave inner faces fitting against the outer convex face of the rounded eccentric b.

Attached to the outer end ofl lthe shaft B (in the present instance by the pin d) -is a curved driver-guide D, having a slot in which fits the curved or segmental driver C. The shuttle E, which rotates in the race B in the usual manner, is provided with two holes orrecesses @,diametrically opposite each other,vand which are alternately entered by the extremi- 6o ties or horns of the alternating driver C, and the latter is, as herein shown, held in place in its slot in the shaft A by a plug or block a', which is secured in place by the pin d, which holds the driver-guide D on the shaft A.

The operation of my invention is as follows: As the shaft A rotates the alternating driver C, the wings of which are held against the face of the eccentric h', will be caused to slide back and forth in the rotating driver- 7o guide D, thus causing the ends or horns of the driver to be alternately projected into and withdrawn from the holes or recesses c in the shuttle, and thereby causing the loops of needle-thread to freely pass around the shuttle. The eccentric h is so placed that it is largely below the center of the shaft A, so that that horn of the driver which is uppermost is withdrawn from the shuttle, as shown in Fig.

l, thus allowing the loops of thread to escape 8o from the top of the shuttle as the Ystitches are tightened by the take-up; but when the driver is in the horizontal position shown by Fig. 2 both horns are in engagement with the shuttle. The movements of my sliding alternating driver are smooth and positive, and as the horns thereof, when withdrawn from the shuttle, are brought within the smooth outer face of the driver-guide D the latter serves as a guard to prevent the loops of thread g'o from catching onv the ends of said horns.

I claim- 1. In a sewing-machine, the combination, with a shuttle-race, a shuttle having-'two diametricallyopposite recesses, and a rotary shuttle-operating shaft having a slot at or near its forward end, of a station ary eccentric near the said forward end of said shaft, a sliding alternating segmental shuttle-driveritted in said slot and having wings or projections I' f alternating segmental shuttle-driver fitted in said slot and having wings or projections with concave inner faces fitting the convex face of said eccentric, and a shuttle-drivel' guide rigid with said shaft and having,r a slot in which said driver slides back and forth as said shaft rotates.

In testimony whereof I aiix my sign ature in presence of two witnesses.

ALBERT RONTKE. Witnesses:

JAMES BOLTON, EDW. A. SAALFELD. 

